expression, noun
activist shareholder; outspoken shareholder
A shareholder who actively voices opinions or demands changes in a company's management, often at shareholder meetings.
物言う株主が株主総会で経営陣に厳しい質問をした。
An activist shareholder asked tough questions to the management at the shareholders' meeting.
最近、物言う株主の影響力が増している。
Recently, the influence of activist shareholders has been growing.
株主 is a general term for 'shareholder', while 物言う株主 specifically refers to an activist or outspoken shareholder.
Compound of 物言う (ものいう, 'to speak out, to object') + 株主 (かぶぬし, 'shareholder').